Question 490164
{{{2(a+b)^2+3(a+b)-2}}}

let (a+b)=x

{{{2x^2+3x-2}}}

{{{2x^2+4x-x-2}}}

{{{2x(x+2)-1(x+2)}}}

(x+2)(2x-1)

Replace x

(a+b+2)(2a+2b-1)